Here's mine in cobalt blue. The measurements match the one on ebay, except for the stopper Mine is 5.3 cm, the same size as the top rim. My wife doesn't remember where it came from. I am fairly certain of the provenance, but one's memory does change with age.

Again, no label, no mark. We need to find out if Dartington made these decanters in colours other than clear before jumping into an attribution. Many attributions on auction sites are just wishfull thinking. Is the stopper on yours exactly the same? It's not too easy to tell from your images.

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Cheers, Sue (M)

Three Wise Women would have asked for directions, arrived on time, delivered the baby, cleaned the stables and made a casserole...